Remarkable Metal-Rich Ternary Chalcogenides Sc₁₄M₃Te₈ (M = Ru, Os)

Abstract

In this novel motif, scandium atoms define infinite parallel chains of alternate trans-face-sharing cubes and pairs of square antiprisms in which each polyhedron is also centered by an M atom (M = Ru, Os). These chains are further linked into a three-dimensional structure by Sc(Te2Te4/2) octahedra. Physical property measurements show Sc14Ru3Te8 to be metallic and Pauli-paramagnetic, consistent with the results of extended Hückel band structure calculations. Matrix effects are evident in the dimensions within the chains. The major interactions are Sc-M and Sc-Te.

{Os5Lu20}I24, the First Extended Cluster Complex of Lutetium with Eight‐Coordinate Endohedral Osmium Atoms in Two Different Environments

“…For n = 3, {Ir 3 Sc 12 }Br 16 and its derivative {Os 3 Sc 12 }Br 16 Sc, [5] as well as the tellurides {Z 3 Sc 12 }-Te 8 Sc 2-x (with Z = Ru, x = 0.79 and Z = Os, x = 0.18), [13] have been obtained. They all contain chains of square-facesharing square antiprisms and cubes in a ratio of 2:1.…”

Revealing Tendencies in the Electronic Structures of Polar Intermetallic Compounds

“…The transition-metal-centered rare-earth cluster chains observed for certain rare-earth transition-metal halides have also been determined to exist in the crystal structures for certain rare-earth transition-metal tellurides (an overview of the hitherto determined rare-earth transition-metal tellurides comprising groups 7-11 elements is provided in Table 3 [65,66]. Analyses of the nature of bonding in the telluride and the bromide indicated that the bonding in these materials is dominated by the heteroatomic interactions.…”

“…The topologies of these transition-metal-centered rare-earth cluster double chains are similar to those found for the rare-earth cluster chains in [TR 3 ]X 3 -type iodides with R = Y, Gd and T = Mn, Ru, Ir (not all combinations; Figure 2c) [55,62,67]. Analyses of the electronic structures for diverse representatives of the metal-rich rare-earth transition-metal tellurides typically revealed R-R and strong T-R bonding interactions, whereas the R-Te interactions were usually considered as strongly polar or ionic [65,[68][69][70][71][72][73][74][75][76][77][78][79]. An evaluation of the hitherto detected rare-earth transition-metal tellurides for the group 11 transition-metals (Table 3) demonstrates that both metal-and tellurium-rich tellurides have been identified for this group.…”

Exploratory synthesis of reduced rare-earth-metal halides, chalcogenides, intermetallics

“…Six types of ternary R-Z-Te phases have been discovered so far, four of which involve new structure types, namely orthorhombic Sc 6 PdTe 2 [100], Y 5 Tn 2 Te 2 [110,111], and Sc 5 Ni 2 Te 2 [112] that contain metal sheets or rods, plus a network of complex and fairly unrelated tetragonal chains in Sc 14 Ru 3 Te 8 [113]. Only the first three will be discussed.…”